设化为循环小数后，它们的循环节长度分别是m，n，k（即它们的循环节分别有m，n，k位），则m+n+k= ．
直接写出得数×3= ×= ﹣0.25= 72×=÷= ÷= 36÷= ÷=
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×== =
直接写得数4÷= 0×= ÷= ×1.4= ×=0÷= ×10= 30×0.05=
直接写出得数．= = = == = = =
口算．4.2÷= ×3= ÷5= （+）×72=×12= ×1.8= ÷=
化为循环小数后，它们的循环节长度分别是m，n，k（即它们的循环节分别有m，n，k位），则m+n+k= ．
×3= 
×
= 
﹣0.25= 72×
=
÷
= 
÷
= 36÷
= 
÷
=
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
= 
=
= 0×
= 
÷
×1.4= 
×
= 
×10= 30×0.05=
= 
= 
= 
=
= 
= 
= 
=
= 
×3= 
÷5= （
+
）×72=
×12= 
÷
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